kconfig/lxdialog: support resize

In all dialogs now properly catch KEY_RESIZE and take proper action.
In mconf try to behave sensibly when a dialog routine returns
-ERRDISPLAYTOOSMALL.

The original check for a screnn size of 80x19 is kept for now.
It may make sense to remove it later, but thats anyway what
much text is adjusted for.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

7 files changed, 153 insertions, 67 deletions

diff --git a/scripts/kconfig/lxdialog/checklist.c b/scripts/kconfig/lxdialog/checklist.c
index 39becb72444a..cf697080dddd 100644
--- a/scripts/kconfig/lxdialog/checklist.c
+++ b/scripts/kconfig/lxdialog/checklist.c
@@ -125,6 +125,12 @@ int dialog_checklist(const char *title, const char *prompt, int height,
                 }
         }
 
+do_resize:
+        if (getmaxy(stdscr) < (height + 6))
+                return -ERRDISPLAYTOOSMALL;
+        if (getmaxx(stdscr) < (width + 6))
+                return -ERRDISPLAYTOOSMALL;
+
         max_choice = MIN(list_height, item_count());
 
         /* center dialog box on screen */
@@ -303,6 +309,11 @@ int dialog_checklist(const char *title, const char *prompt, int height,
                 case KEY_ESC:
                         key = on_key_esc(dialog);
                         break;
+                case KEY_RESIZE:
+                        delwin(list);
+                        delwin(dialog);
+                        on_key_resize();
+                        goto do_resize;
                 }
 
                 /* Now, update everything... */
diff --git a/scripts/kconfig/lxdialog/dialog.h b/scripts/kconfig/lxdialog/dialog.h
index a7cfdecc2409..8dea47f9d3e4 100644
--- a/scripts/kconfig/lxdialog/dialog.h
+++ b/scripts/kconfig/lxdialog/dialog.h
@@ -86,6 +86,9 @@
 #define ACS_DARROW 'v'
 #endif
 
+/* error return codes */
+#define ERRDISPLAYTOOSMALL (KEY_MAX + 1)
+
 /*
  *   Color definitions
  */
@@ -181,6 +184,7 @@ int item_is_tag(char tag);
 
 /* generic key handlers */
 int on_key_esc(WINDOW *win);
+int on_key_resize(void);
 
 void init_dialog(const char *backtitle);
 void reset_dialog(void);
@@ -199,8 +203,8 @@ int dialog_yesno(const char *title, const char *prompt, int height, int width);
 int dialog_msgbox(const char *title, const char *prompt, int height,
                   int width, int pause);
 int dialog_textbox(const char *title, const char *file, int height, int width);
-int dialog_menu(const char *title, const char *prompt, int height, int width,
-                int menu_height, const void *selected, int *s_scroll);
+int dialog_menu(const char *title, const char *prompt,
+                const void *selected, int *s_scroll);
 int dialog_checklist(const char *title, const char *prompt, int height,
                      int width, int list_height);
 extern char dialog_input_result[];
diff --git a/scripts/kconfig/lxdialog/inputbox.c b/scripts/kconfig/lxdialog/inputbox.c
index edb7975dbaa2..05e72066b359 100644
--- a/scripts/kconfig/lxdialog/inputbox.c
+++ b/scripts/kconfig/lxdialog/inputbox.c
@@ -49,6 +49,17 @@ int dialog_inputbox(const char *title, const char *prompt, int height, int width
         char *instr = dialog_input_result;
         WINDOW *dialog;
 
+        if (!init)
+                instr[0] = '\0';
+        else
+                strcpy(instr, init);
+
+do_resize:
+        if (getmaxy(stdscr) <= (height - 2))
+                return -ERRDISPLAYTOOSMALL;
+        if (getmaxx(stdscr) <= (width - 2))
+                return -ERRDISPLAYTOOSMALL;
+
         /* center dialog box on screen */
         x = (COLS - width) / 2;
         y = (LINES - height) / 2;
@@ -86,11 +97,6 @@ int dialog_inputbox(const char *title, const char *prompt, int height, int width
         wmove(dialog, box_y, box_x);
         wattrset(dialog, dlg.inputbox.atr);
 
-        if (!init)
-                instr[0] = '\0';
-        else
-                strcpy(instr, init);
-
         input_x = strlen(instr);
 
         if (input_x >= box_width) {
@@ -220,6 +226,10 @@ int dialog_inputbox(const char *title, const char *prompt, int height, int width
                 case KEY_ESC:
                         key = on_key_esc(dialog);
                         break;
+                case KEY_RESIZE:
+                        delwin(dialog);
+                        on_key_resize();
+                        goto do_resize;
                 }
         }
 
diff --git a/scripts/kconfig/lxdialog/menubox.c b/scripts/kconfig/lxdialog/menubox.c
index d3305bad15c7..fcd95a985328 100644
--- a/scripts/kconfig/lxdialog/menubox.c
+++ b/scripts/kconfig/lxdialog/menubox.c
@@ -179,14 +179,25 @@ static void do_scroll(WINDOW *win, int *scroll, int n)
 /*
  * Display a menu for choosing among a number of options
  */
-int dialog_menu(const char *title, const char *prompt, int height, int width,
-                int menu_height, const void *selected, int *s_scroll)
+int dialog_menu(const char *title, const char *prompt,
+                const void *selected, int *s_scroll)
 {
         int i, j, x, y, box_x, box_y;
+        int height, width, menu_height;
         int key = 0, button = 0, scroll = 0, choice = 0;
         int first_item =  0, max_choice;
         WINDOW *dialog, *menu;
 
+do_resize:
+        height = getmaxy(stdscr);
+        width = getmaxx(stdscr);
+        if (height < 15 || width < 65)
+                return -ERRDISPLAYTOOSMALL;
+
+        height -= 4;
+        width  -= 5;
+        menu_height = height - 10;
+
         max_choice = MIN(menu_height, item_count());
 
         /* center dialog box on screen */
@@ -226,7 +237,10 @@ int dialog_menu(const char *title, const char *prompt, int height, int width,
         draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
                  dlg.menubox_border.atr, dlg.menubox.atr);
 
-        item_x = (menu_width - 70) / 2;
+        if (menu_width >= 80)
+                item_x = (menu_width - 70) / 2;
+        else
+                item_x = 4;
 
         /* Set choice to default item */
         item_foreach()
@@ -407,6 +421,11 @@ int dialog_menu(const char *title, const char *prompt, int height, int width,
                 case KEY_ESC:
                         key = on_key_esc(menu);
                         break;
+                case KEY_RESIZE:
+                        on_key_resize();
+                        delwin(menu);
+                        delwin(dialog);
+                        goto do_resize;
                 }
         }
         delwin(menu);
diff --git a/scripts/kconfig/lxdialog/textbox.c b/scripts/kconfig/lxdialog/textbox.c
index a99e1f497d67..fabfc1ad789d 100644
--- a/scripts/kconfig/lxdialog/textbox.c
+++ b/scripts/kconfig/lxdialog/textbox.c
@@ -25,7 +25,7 @@ static void back_lines(int n);
 static void print_page(WINDOW * win, int height, int width);
 static void print_line(WINDOW * win, int row, int width);
 static char *get_line(void);
-static void print_position(WINDOW * win, int height, int width);
+static void print_position(WINDOW * win);
 
 static int hscroll;
 static int begin_reached, end_reached, page_length;
@@ -33,14 +33,28 @@ static const char *buf;
 static const char *page;
 
 /*
+ * refresh window content
+ */
+static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
+                                                          int cur_y, int cur_x)
+{
+        print_page(box, boxh, boxw);
+        print_position(dialog);
+        wmove(dialog, cur_y, cur_x);    /* Restore cursor position */
+        wrefresh(dialog);
+}
+
+
+/*
  * Display text from a file in a dialog box.
  */
-int dialog_textbox(const char *title, const char *tbuf, int height, int width)
+int dialog_textbox(const char *title, const char *tbuf,
+                   int initial_height, int initial_width)
 {
         int i, x, y, cur_x, cur_y, key = 0;
-        int texth, textw;
+        int height, width, boxh, boxw;
         int passed_end;
-        WINDOW *dialog, *text;
+        WINDOW *dialog, *box;
 
         begin_reached = 1;
         end_reached = 0;
@@ -49,6 +63,25 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
         buf = tbuf;
         page = buf;     /* page is pointer to start of page to be displayed */
 
+do_resize:
+        getmaxyx(stdscr, height, width);
+        if (height < 8 || width < 8)
+                return -ERRDISPLAYTOOSMALL;
+        if (initial_height != 0)
+                height = initial_height;
+        else
+                if (height > 4)
+                        height -= 4;
+                else
+                        height = 0;
+        if (initial_width != 0)
+                width = initial_width;
+        else
+                if (width > 5)
+                        width -= 5;
+                else
+                        width = 0;
+
         /* center dialog box on screen */
         x = (COLS - width) / 2;
         y = (LINES - height) / 2;
@@ -58,14 +91,14 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
         dialog = newwin(height, width, y, x);
         keypad(dialog, TRUE);
 
-        /* Create window for text region, used for scrolling text */
-        texth = height - 4;
-        textw = width - 2;
-        text = subwin(dialog, texth, textw, y + 1, x + 1);
-        wattrset(text, dlg.dialog.atr);
-        wbkgdset(text, dlg.dialog.atr & A_COLOR);
+        /* Create window for box region, used for scrolling text */
+        boxh = height - 4;
+        boxw = width - 2;
+        box = subwin(dialog, boxh, boxw, y + 1, x + 1);
+        wattrset(box, dlg.dialog.atr);
+        wbkgdset(box, dlg.dialog.atr & A_COLOR);
 
-        keypad(text, TRUE);
+        keypad(box, TRUE);
 
         /* register the new window, along with its borders */
         draw_box(dialog, 0, 0, height, width,
@@ -86,11 +119,8 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
         getyx(dialog, cur_y, cur_x);    /* Save cursor position */
 
         /* Print first page of text */
-        attr_clear(text, texth, textw, dlg.dialog.atr);
-        print_page(text, texth, textw);
-        print_position(dialog, height, width);
-        wmove(dialog, cur_y, cur_x);    /* Restore cursor position */
-        wrefresh(dialog);
+        attr_clear(box, boxh, boxw, dlg.dialog.atr);
+        refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
 
         while ((key != KEY_ESC) && (key != '\n')) {
                 key = wgetch(dialog);
@@ -99,7 +129,7 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
                 case 'e':
                 case 'X':
                 case 'x':
-                        delwin(text);
+                        delwin(box);
                         delwin(dialog);
                         return 0;
                 case 'g':       /* First page */
@@ -107,10 +137,8 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
                         if (!begin_reached) {
                                 begin_reached = 1;
                                 page = buf;
-                                print_page(text, texth, textw);
-                                print_position(dialog, height, width);
-                                wmove(dialog, cur_y, cur_x);    /* Restore cursor position */
-                                wrefresh(dialog);
+                                refresh_text_box(dialog, box, boxh, boxw,
+                                                 cur_y, cur_x);
                         }
                         break;
                 case 'G':       /* Last page */
@@ -119,11 +147,9 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
                         end_reached = 1;
                         /* point to last char in buf */
                         page = buf + strlen(buf);
-                        back_lines(texth);
-                        print_page(text, texth, textw);
-                        print_position(dialog, height, width);
-                        wmove(dialog, cur_y, cur_x);    /* Restore cursor position */
-                        wrefresh(dialog);
+                        back_lines(boxh);
+                        refresh_text_box(dialog, box, boxh, boxw,
+                                         cur_y, cur_x);
                         break;
                 case 'K':       /* Previous line */
                 case 'k':
@@ -138,16 +164,16 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
                                  * point to start of next page. This is done
                                  * by calling get_line() in the following
                                  * 'for' loop. */
-                                scrollok(text, TRUE);
-                                wscrl(text, -1);        /* Scroll text region down one line */
-                                scrollok(text, FALSE);
+                                scrollok(box, TRUE);
+                                wscrl(box, -1); /* Scroll box region down one line */
+                                scrollok(box, FALSE);
                                 page_length = 0;
                                 passed_end = 0;
-                                for (i = 0; i < texth; i++) {
+                                for (i = 0; i < boxh; i++) {
                                         if (!i) {
                                                 /* print first line of page */
-                                                print_line(text, 0, textw);
-                                                wnoutrefresh(text);
+                                                print_line(box, 0, boxw);
+                                                wnoutrefresh(box);
                                         } else
                                                 /* Called to update 'end_reached' and 'page' */
                                                 get_line();
@@ -157,7 +183,7 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
                                                 passed_end = 1;
                                 }
 
-                                print_position(dialog, height, width);
+                                print_position(dialog);
                                 wmove(dialog, cur_y, cur_x);    /* Restore cursor position */
                                 wrefresh(dialog);
                         }
@@ -167,23 +193,21 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
                 case KEY_PPAGE:
                         if (begin_reached)
                                 break;
-                        back_lines(page_length + texth);
-                        print_page(text, texth, textw);
-                        print_position(dialog, height, width);
-                        wmove(dialog, cur_y, cur_x);
-                        wrefresh(dialog);
+                        back_lines(page_length + boxh);
+                        refresh_text_box(dialog, box, boxh, boxw,
+                                         cur_y, cur_x);
                         break;
                 case 'J':       /* Next line */
                 case 'j':
                 case KEY_DOWN:
                         if (!end_reached) {
                                 begin_reached = 0;
-                                scrollok(text, TRUE);
-                                scroll(text);   /* Scroll text region up one line */
-                                scrollok(text, FALSE);
-                                print_line(text, texth - 1, textw);
-                                wnoutrefresh(text);
-                                print_position(dialog, height, width);
+                                scrollok(box, TRUE);
+                                scroll(box);    /* Scroll box region up one line */
+                                scrollok(box, FALSE);
+                                print_line(box, boxh - 1, boxw);
+                                wnoutrefresh(box);
+                                print_position(dialog);
                                 wmove(dialog, cur_y, cur_x);    /* Restore cursor position */
                                 wrefresh(dialog);
                         }
@@ -194,10 +218,8 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
                                 break;
 
                         begin_reached = 0;
-                        print_page(text, texth, textw);
-                        print_position(dialog, height, width);
-                        wmove(dialog, cur_y, cur_x);
-                        wrefresh(dialog);
+                        refresh_text_box(dialog, box, boxh, boxw,
+                                         cur_y, cur_x);
                         break;
                 case '0':       /* Beginning of line */
                 case 'H':       /* Scroll left */
@@ -212,9 +234,8 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
                                 hscroll--;
                         /* Reprint current page to scroll horizontally */
                         back_lines(page_length);
-                        print_page(text, texth, textw);
-                        wmove(dialog, cur_y, cur_x);
-                        wrefresh(dialog);
+                        refresh_text_box(dialog, box, boxh, boxw,
+                                         cur_y, cur_x);
                         break;
                 case 'L':       /* Scroll right */
                 case 'l':
@@ -224,16 +245,21 @@ int dialog_textbox(const char *title, const char *tbuf, int height, int width)
                         hscroll++;
                         /* Reprint current page to scroll horizontally */
                         back_lines(page_length);
-                        print_page(text, texth, textw);
-                        wmove(dialog, cur_y, cur_x);
-                        wrefresh(dialog);
+                        refresh_text_box(dialog, box, boxh, boxw,
+                                         cur_y, cur_x);
                         break;
                 case KEY_ESC:
                         key = on_key_esc(dialog);
                         break;
+                case KEY_RESIZE:
+                        back_lines(height);
+                        delwin(box);
+                        delwin(dialog);
+                        on_key_resize();
+                        goto do_resize;
                 }
         }
-        delwin(text);
+        delwin(box);
         delwin(dialog);
         return key;             /* ESC pressed */
 }
@@ -353,13 +379,13 @@ static char *get_line(void)
 /*
  * Print current position
  */
-static void print_position(WINDOW * win, int height, int width)
+static void print_position(WINDOW * win)
 {
         int percent;
 
         wattrset(win, dlg.position_indicator.atr);
         wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
         percent = (page - buf) * 100 / strlen(buf);
-        wmove(win, height - 3, width - 9);
+        wmove(win, getmaxy(win) - 3, getmaxx(win) - 9);
         wprintw(win, "(%3d%%)", percent);
 }
diff --git a/scripts/kconfig/lxdialog/util.c b/scripts/kconfig/lxdialog/util.c
index cb21dc4dd9fc..ebc781b493d7 100644
--- a/scripts/kconfig/lxdialog/util.c
+++ b/scripts/kconfig/lxdialog/util.c
@@ -509,6 +509,12 @@ int on_key_esc(WINDOW *win)
         return -1;
 }
 
+/* redraw screen in new size */
+int on_key_resize(void)
+{
+        dialog_clear();
+        return KEY_RESIZE;
+}
 
 struct dialog_list *item_cur;
 struct dialog_list item_nil;
diff --git a/scripts/kconfig/lxdialog/yesno.c b/scripts/kconfig/lxdialog/yesno.c
index 8364f9dd01c3..ee0a04e3e012 100644
--- a/scripts/kconfig/lxdialog/yesno.c
+++ b/scripts/kconfig/lxdialog/yesno.c
@@ -44,6 +44,12 @@ int dialog_yesno(const char *title, const char *prompt, int height, int width)
         int i, x, y, key = 0, button = 0;
         WINDOW *dialog;
 
+do_resize:
+        if (getmaxy(stdscr) < (height + 4))
+                return -ERRDISPLAYTOOSMALL;
+        if (getmaxx(stdscr) < (width + 4))
+                return -ERRDISPLAYTOOSMALL;
+
         /* center dialog box on screen */
         x = (COLS - width) / 2;
         y = (LINES - height) / 2;
@@ -96,6 +102,10 @@ int dialog_yesno(const char *title, const char *prompt, int height, int width)
                 case KEY_ESC:
                         key = on_key_esc(dialog);
                         break;
+                case KEY_RESIZE:
+                        delwin(dialog);
+                        on_key_resize();
+                        goto do_resize;
                 }
         }